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Du Z, Lu B, Li D, Chai X. Strengthening nitrogen removal of rural wastewater treatment in humus biochemical system under low dissolved oxygen conditions: Sludge and microbial characteristics. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 366:121762. [PMID: 39067308 DOI: 10.1016/j.jenvman.2024.121762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Revised: 06/20/2024] [Accepted: 07/04/2024] [Indexed: 07/30/2024]
Abstract
To achieve efficient and cost-effective treatment for the rural wastewater, a novel humus biochemical system (HBS) process derived from humus bio-functional material was proposed to treat rural wastewater under low dissolved oxygen (DO) conditions, and the operational performance, sludge characteristics, and microbial community in HBS were systematically investigated in this study. The results indicated that the HBS reactor could be operated stably under low DO levels of 0.2-0.8 mg/L, and maintained high removal efficiencies of 96.4%, 96.0%, and 88.2% for chemical oxygen demand, ammonia nitrogen, and total nitrogen, with corresponding effluent concentrations of 11.0, 1.7, and 5.1 mg/L, respectively. The sludge produced from HBS was characterized by relatively large particle size, complex structural morphology, and abundant humic substances, which favorably improved the system stability. Illumina sequencing demonstrated that HBS reactor possessed high microbial abundance and diversity and was enriched with plenty of nitrifying and denitrifying bacteria, which synergistically intensified the whole biological nitrogen removal process in this system. The study presented the feasibility and adaptability of HBS for energy-efficient rural wastewater treatment.
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Affiliation(s)
- Zhengliang Du
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Bin Lu
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Dong Li
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Xiaoli Chai
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
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2
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Zou H, He J, Chu Y, Xu B, Li W, Huang S, Guan X, Liu F, Li H. Revealing discrepancies and drivers in the impact of lomefloxacin on groundwater denitrification throughout microbial community growth and succession. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133139. [PMID: 38056273 DOI: 10.1016/j.jhazmat.2023.133139] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 10/31/2023] [Accepted: 11/28/2023] [Indexed: 12/08/2023]
Abstract
The coexistence of antibiotics and nitrates has raised great concern about antibiotic's impact on denitrification. However, conflicting results in these studies are very puzzling, possibly due to differences in microbial succession stages. This study investigated the effects of the high-priority urgent antibiotic, lomefloxacin (LOM), on groundwater denitrification throughout microbial growth and succession. The results demonstrated that LOM's impact on denitrification varied significantly across three successional stages, with the most pronounced effects exhibited in the initial stage (53.8% promotion at 100 ng/L-LOM, 84.6% inhibition at 100 μg/L-LOM), followed by the decline stage (13.3-18.2% inhibition), while no effect in the stable stage. Hence, a distinct pattern encompassing susceptibility, insusceptibility, and sub-susceptibility in LOM's impact on denitrification was discovered. Microbial metabolism and environment variation drove the pattern, with bacterial numbers and antibiotic resistance as primary influencers (22.5% and 15.3%, p < 0.01), followed by carbon metabolism and microbial community (5.0% and 3.68%, p < 0.01). The structural equation model confirmed results reliability. Bacterial numbers and resistance influenced susceptibility by regulating compensation and bacteriostasis, while carbon metabolism and microbial community impacted energy, electron transfer, and gene composition. These findings provide valuable insights into the complex interplay between antibiotics and denitrification patterns in groundwater.
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Affiliation(s)
- Hua Zou
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Jiangtao He
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China.
| | - Yanjia Chu
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Baoshi Xu
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Wei Li
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Shiwen Huang
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Xiangyu Guan
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
| | - Fei Liu
- Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences, Beijing 100083, China; MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences, Beijing 100083, China
| | - Haiyan Li
- School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
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Wang Y, Wang H, Chen H. Response of aerobic activated sludge to edible oil exposure: Extracellular polymeric substance (EPS) characteristics and microbial community. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 335:117571. [PMID: 36871358 DOI: 10.1016/j.jenvman.2023.117571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Revised: 02/13/2023] [Accepted: 02/21/2023] [Indexed: 06/18/2023]
Abstract
Aerobic activated sludge is widely used to degrade edible oil wastewater in wastewater treatment plants. During this process, the observed poor organics removal performance might be caused by poor sludge settling performance, which might be influenced by extracellular polymeric substances (EPS) and the structure of the microbial community. However, this hypothesis was not confirmed. Thus, this study investigated the response of activated sludge to 50% and 100% edible oil exposure in comparison to glucose, focusing on organics removal performance, characteristics of sludge, EPS, and microbial community structure. Results showed that both concentrations of edible oil influenced the systems' performance, although 100% edible oil showed more significant negative effects than 50% edible oil. The mechanisms behind the influence of edible oil on the aerobic activated sludge system and the differences between the different concentrations of edible oil were revealed. The worse system performance in the edible oil exposure system was due to the worse sludge settling performance, which was significantly affected by edible oil (p < 0.05). The sludge settling performance was mainly inhibited by promoting the formation of floating particles and the enrichment of filamentous bacteria in the 50% edible oil exposure system; biosurfactant secretion was also speculated as the reason, in addition to the above factors, in the 100% edible oil exposure system. The macroscopic largest floating particles, highest total relative abundance of foaming bacteria and biosurfactant production genera (34.32%), lowest surface tension (43.7 mN/m), and highest emulsifying activity (E24 = 25%) of EPS in 100% edible oil exposure systems provide strong evidence.
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Affiliation(s)
- Yanqiong Wang
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Hongwu Wang
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Key Laboratory of Urban Water Supply, Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources, Shanghai, 200092, China.
| | - Hongbin Chen
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; National Engineering Research Center for Urban Pollution Control, Tongji University, Shanghai, 200092, China
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Zhao J, Wang Y, Guan D, Fu Z, Zhang Q, Guo L, Sun Y, Zhang Q, Wang D. Calcium hypochlorite-coupled aged refuse promotes hydrogen production from sludge anaerobic fermentation. BIORESOURCE TECHNOLOGY 2023; 370:128534. [PMID: 36574889 DOI: 10.1016/j.biortech.2022.128534] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/20/2022] [Accepted: 12/23/2022] [Indexed: 06/17/2023]
Abstract
This work investigated the effect of calcium hypochlorite (CH) coupled aged refuse (AR) treatment on the enhanced hydrogen generation from sludge anaerobic dark fermentation (SADF). The enhanced mechanism was systematically revealed through sludge disintegration, organic matter biotransformation, and microbial community characteristics, etc. The experimental data showed that CH coupled AR increased the hydrogen yield to 18.1 mL/g, significantly higher than that in the AR or CH group alone. Mechanistic analysis showed that CH-coupled AR significantly promoted sludge disintegration and hydrolysis processes, providing sufficient material for hydrogen-producing bacteria. Microbiological analysis showed that CH-coupled AR increased the relative abundance of responsible hydrogen-producing microorganisms. In addition, CH-coupled AR was very effective in reducing phosphate content in the fermentation liquid and fecal coliforms in the digestate, thus facilitating the subsequent treatment of fermentation broth and digestate. CH coupled AR is an alternative strategy to increase hydrogen production from sludge.
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Affiliation(s)
- Jianwei Zhao
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China; School of Ecological and Environmental Sciences, East China Normal University, 200241 Shanghai, China; College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
| | - Yuxin Wang
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
| | - Dezheng Guan
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
| | - Zhou Fu
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
| | - Qi Zhang
- Qingdao Jiebao Ecological Technology Co., Ltd, Qingdao 266113, China
| | - Liang Guo
- Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
| | - Yingjie Sun
- Qingdao Solid Waste Pollution Control and Recycling Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, China
| | - Qiuzhuo Zhang
- School of Ecological and Environmental Sciences, East China Normal University, 200241 Shanghai, China
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
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de Souza EC, Gomes JPS, Pimenta AS, de Azevedo TKB, Pereira AKS, Gomes RM, Brito JO, Dias Júnior AF. Briquette production as a sustainable alternative for waste management in the tannin extraction industry. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:18078-18090. [PMID: 36205870 DOI: 10.1007/s11356-022-23490-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
Tannins are polyphenols that can be extracted from different parts of the plant and have different known commercial applications. The extraction of tannins generates a significant amount of low-density wastes. An alternative that can be applied to ensure energy reuse of this low-density waste is a densification process, such as briquetting. Thus, this research work aimed to assess the energy potential of the residue from the extraction of tannins of different forest species, aiming at its energy reuse in the form of briquettes. Stem barks of 6 forest species (Acacia mangium, AM; Anacardium occidentale, AO; Anadenanthera colubrina, AC; Azadirachta indica, AI; Mimosa caesalpiniaefolia, MC; Mimosa tenuiflora, MT) were used after tannin extraction. Bulk density, energy (higher, lower, and net heating value) and thermal (TG/DTG) properties, and chemical constitution (extractives, lignin, and holocellulose) of the materials were determined. In addition, briquette compaction ratio, apparent density, volumetric expansion, and water adsorption over the days were evaluated. The highest bulk densities were found in the barks of Anadenanthera colubrina (0.529 g.cm-3) and Mimosa tenuiflora (0.407 g.cm-3), whereas the species that showed the best result of higher heating value was Acacia mangium (20.44 MJ.kg-1), followed by Azadirachta indica (19.39 MJ.kg-1) and Mimosa caesalpiniifolia (18.85 MJ.kg-1). Briquetting increased the density of the evaluated material by 2.3 to 4.9 times. All briquettes produced with wastes from tannin extraction evaluated in this work showed potential for energy production. With more information on the quantification of waste generated and data on the economic viability of production, these tannin-producing industries can benefit both environmentally and economically, by reusing these wastes for energy production.
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Affiliation(s)
- Elias Costa de Souza
- Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz (USP/ESALQ), Av. Pádua Dias, 11, Piracicaba, São Paulo State, Brazil.
- Departamento de Tecnologia e Recursos Naturais (DTRN), Universidade Estadual Do Pará (UEPA), Campus VI, Rodovia PA-125, Paragominas, Pará, 68625-000, Brazil.
| | - João Paulo Silva Gomes
- Engenharia Florestal, Escola Agrícola de Jundiaí, Programa de Pós-Graduação Em Ciências Florestais (PPGCFL), Forest, Bioenergy and Environment Research Group, Universidade Federal Do Rio Grande Do Norte (UFRN), Rodovia RN 160, km 03, Distrito de Jundiaí, P.O. box 07, Macaíba, RN, CEP 59.280-000, Brazil
| | - Alexandre Santos Pimenta
- Engenharia Florestal, Escola Agrícola de Jundiaí, Programa de Pós-Graduação Em Ciências Florestais (PPGCFL), Forest, Bioenergy and Environment Research Group, Universidade Federal Do Rio Grande Do Norte (UFRN), Rodovia RN 160, km 03, Distrito de Jundiaí, P.O. box 07, Macaíba, RN, CEP 59.280-000, Brazil
| | - Tatiane Kelly Barbosa de Azevedo
- Engenharia Florestal, Escola Agrícola de Jundiaí, Programa de Pós-Graduação Em Ciências Florestais (PPGCFL), Forest, Bioenergy and Environment Research Group, Universidade Federal Do Rio Grande Do Norte (UFRN), Rodovia RN 160, km 03, Distrito de Jundiaí, P.O. box 07, Macaíba, RN, CEP 59.280-000, Brazil
| | - Allana Katiussya Silva Pereira
- Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz (USP/ESALQ), Av. Pádua Dias, 11, Piracicaba, São Paulo State, Brazil
| | - Regina Maria Gomes
- Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz (USP/ESALQ), Av. Pádua Dias, 11, Piracicaba, São Paulo State, Brazil
| | - José Otávio Brito
- Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz (USP/ESALQ), Av. Pádua Dias, 11, Piracicaba, São Paulo State, Brazil
| | - Ananias Francisco Dias Júnior
- Departamento de Ciências Florestais E da Madeira, Universidade Federal Do Espírito Santo (UFES), Av. Governador Lindemberg, 316, Jerônimo Monteiro, ES, 29550-000, Brazil
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Zhou X, Zhai S, Zhao Y, Liu D, Wang Q, Ji M. Rapid recovery of inhibited denitrification with cascade Cr(VI) exposure by bio-accelerant: Characterization of chromium distributions, EPS compositions and denitrifying communities. JOURNAL OF HAZARDOUS MATERIALS 2021; 411:125087. [PMID: 33476908 DOI: 10.1016/j.jhazmat.2021.125087] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 12/21/2020] [Accepted: 01/06/2021] [Indexed: 06/12/2023]
Abstract
Hexavalent chromium (Cr(VI)) may inhibit denitrification in biological wastewater treatment systems, and the inhibited denitrification process is difficult to recover in a short time. This study explored Cr(VI) cascade impact (20-125 mg L-1) on denitrification and developed one nontoxic biological accelerant (combination of L-cysteine, flavin adenine dinucleotide, biotin and cytokinin) for denitrification recovery. The results showed that NO3--N removal efficiency decreased from 75.7% to 21.5% when Cr(VI) concentration increased from 80 to 125 mg L-1. Addition of accelerant could effectively promote the removal of NO3--N, and observably reduce the recovery time (42 T) compared with natural recovery (63 T). Furthermore, the main site of Cr(VI) reduction and Cr(III) immobilization was located in the intercellular compartment of the biofilm. Microbes produced more tightly bound extracellular polymeric substances (TB-EPS) to protect them from toxicity under the low Cr(VI) concentrations, while low EPS was secreted when Cr(VI) concentration was higher than 60 mg L-1. Compared to natural recovery system, bio-accelerant addition was beneficial to the recovery of denitrifiers activities, especially for the bacteria containing nirS gene. The results facilitated an understanding of Cr(VI) impact on denitrification, and the proposed bio-accelerant can be potentially applied to heavy metal shock-loading emergency situations.
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Affiliation(s)
- Xu Zhou
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Siyuan Zhai
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Yingxin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
| | - Duo Liu
- The Ninth Waterworks of Beijing Waterworks Group Co., Ltd, Beijing 100012, China
| | - Qian Wang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Min Ji
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
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Shi X, Zhu L, Li B, Liang J, Li XY. Surfactant-assisted thermal hydrolysis off waste activated sludge for improved dewaterability, organic release, and volatile fatty acid production. WASTE MANAGEMENT (NEW YORK, N.Y.) 2021; 124:339-347. [PMID: 33662765 DOI: 10.1016/j.wasman.2021.02.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 12/27/2020] [Accepted: 02/13/2021] [Indexed: 06/12/2023]
Abstract
The surfactant-assisted thermal hydrolysis pretreatment (THP) of waste activated sludge (WAS) was investigated, focusing on the effect of the surfactant addition on the results of sludge disintegration, dewaterability, organic release, and production of volatile fatty acids (VFAs) via fermentation. Typical anionic surfactant sodium dodecyl sulfate (SDS) and cationic surfactant cetyl trimethyl ammonium bromide (CTAB) were used for the THP experiments. The supernatant of the THP-treated sludge was anaerobically fermented to determine its potential VFAs yield. The results showed that the surfactant addition, particularly CTAB, enhanced the hydrolysis and organic solubilization of the sludge during THP. CTAB addition led to a 36% increase of dissolved organic and a 27% increase of VFAs production. For the THP-treated sludge with the surfactant addition, its dewaterability was also greatly improved. When the CTAB dosage increased from 0 to 0.10 g/g VSS, the minimum capillary suction time (CST) of the sludge decreased from 205 to 50 s/g TSS, and the sludge particles became smaller and less negative with the zeta potential changing from -12.4 to -8.2 mV. Analysis of extracellular polymeric substances (EPS) of the sludge revealed that the surfactant addition increased the sludge disintegration and organic dissolution during the THP process. The surfactant-assisted THP is shown to be a promising technology to enhance the WAS treatment for improved sludge dewaterability, waste reduction, and resource recovery.
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Affiliation(s)
- Xuchuan Shi
- Shenzhen Environmental Science and New Energy Laboratory, Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen, China; Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Ling Zhu
- Shenzhen Environmental Science and New Energy Laboratory, Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen, China; Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Bing Li
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Jiajin Liang
- Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China
| | - Xiao-Yan Li
- Shenzhen Environmental Science and New Energy Laboratory, Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen, China; Shenzhen Engineering Research Laboratory for Sludge and Food Waste Treatment and Resource Recovery, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Guangdong Provincial Engineering Research Centre for Urban Water Recycling and Environmental Safety, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China; Environmental Engineering Research Centre, Department of Civil Engineering, The University of Hong Kong, Pokfulam, Hong Kong, China.
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Hua D, Fan Q, Zhao Y, Xu H, Chen L, Li Y. Comparison of methanogenic potential of wood vinegar with gradient loads in batch and continuous anaerobic digestion and microbial community analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 739:139943. [PMID: 32534316 DOI: 10.1016/j.scitotenv.2020.139943] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/01/2020] [Accepted: 06/02/2020] [Indexed: 06/11/2023]
Abstract
Anaerobic digestion (AD) of wood vinegar wastewater (WVWW) has considerable potential in energy recovery and sustainable development. WVWW contains abundant acetic acid and some refractory organics. Therefore, the batch and continuous AD of WVWW were investigated. The threshold value of the inhibitory concentration was obtained at a chemical oxygen demand (COD) of 4 g/L in batch AD. Three-dimensional electrolysis was adopted to improve the biodegradability of WVWW, and a reduction in the inhibitory rate from 38.2% to 4.9% and an increase in methane production by 53.8% were observed. The up-flow anaerobic sludge blanket reactor achieved an efficient conversion of methane at an organic loading rate (OLR) of <8.58 g COD/L·d. However, the OLR of 10.01 g COD/L·d decreased the methane production from 350.6 to 42.5 mL CH4/g CODfed. Aminicenantales, Acetobacterium, Anaerolineae, and SBR1031 were the dominant bacterial genera in continuous AD. Fewer genera with similar classifications were detected in the batch AD. In the archaea community, acetotrophic methanogens (Methanosaeta) dominated and increased continuously with increasing OLR. Microbial analysis revealed that toxic substances affected bacterial diversity and promoted the enrichment of Intestinimonas, Syntropobacter, and Propionicimonas at high OLRs. The continuous AD was most suitable for the energy recovery from WVWW.
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Affiliation(s)
- Dongliang Hua
- Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Biomass Gasification Technology, Jinan 250014, China; School of Energy and Power Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
| | - Qingwen Fan
- Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Biomass Gasification Technology, Jinan 250014, China
| | - Yuxiao Zhao
- Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Biomass Gasification Technology, Jinan 250014, China; School of Energy and Power Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
| | - Haipeng Xu
- Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Biomass Gasification Technology, Jinan 250014, China; School of Energy and Power Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
| | - Lei Chen
- Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Biomass Gasification Technology, Jinan 250014, China; School of Energy and Power Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
| | - Yan Li
- Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Shandong Provincial Key Laboratory of Biomass Gasification Technology, Jinan 250014, China; School of Energy and Power Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China; State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China.
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Hua D, Fan Q, Zhao Y, Xu H, Chen L, Si H, Li Y. Continuous Anaerobic Digestion of Wood Vinegar Wastewater From Pyrolysis: Microbial Diversity and Functional Genes Prediction. Front Bioeng Biotechnol 2020; 8:923. [PMID: 32850755 PMCID: PMC7422680 DOI: 10.3389/fbioe.2020.00923] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 07/17/2020] [Indexed: 01/21/2023] Open
Abstract
Wood vinegar wastewater (WVWW) is the main by-product of biomass pyrolysis process, which is more suitable to use anaerobic digestion (AD) to achieve energy recovery due to its large amount of organic matter. In this study, the up-flow anaerobic sludge bed (UASB) reactor was used to investigate the continuous anaerobic transformation of WVWW with gradient concentrations (0.3, 0.675, 1, 2, 3, 4, 5, 6, and 7 g COD/L). Then, the changes of microbial community, diversity index and functional gene were analyzed in detail. The results revealed that WVWW showed good AD performance in continuous fermentation. WVWW of organic loading rate (OLR) of >8.58 g COD/L⋅d showed severe inhibition on biodegradability and methane production, which is mainly due to the toxic substances as compared with the control group. The bacterial communities were dominated by phyla of Chloroflexi, Firmicutes, Proteobacteria, Acidobacteria, Synergistetes, and Actinobacteria. The gene abundances related to energy production, carbohydrate transport and metabolism were relatively high, which are mainly responsible for carbon forms conversion and carbohydrate degradation. This study will provide a basis for the screening and enrichment of functional bacteria and genes.
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Affiliation(s)
- Dongliang Hua
- Shandong Provincial Key Laboratory of Biomass Gasification Technology, Shandong Academy of Sciences, Energy Research Institute, Qilu University of Technology, Jinan, China
| | - Qingwen Fan
- Shandong Provincial Key Laboratory of Biomass Gasification Technology, Shandong Academy of Sciences, Energy Research Institute, Qilu University of Technology, Jinan, China
| | - Yuxiao Zhao
- Shandong Provincial Key Laboratory of Biomass Gasification Technology, Shandong Academy of Sciences, Energy Research Institute, Qilu University of Technology, Jinan, China
| | - Haipeng Xu
- Shandong Provincial Key Laboratory of Biomass Gasification Technology, Shandong Academy of Sciences, Energy Research Institute, Qilu University of Technology, Jinan, China
| | - Lei Chen
- Shandong Provincial Key Laboratory of Biomass Gasification Technology, Shandong Academy of Sciences, Energy Research Institute, Qilu University of Technology, Jinan, China
| | - Hongyu Si
- Shandong Provincial Key Laboratory of Biomass Gasification Technology, Shandong Academy of Sciences, Energy Research Institute, Qilu University of Technology, Jinan, China
| | - Yan Li
- Shandong Provincial Key Laboratory of Biomass Gasification Technology, Shandong Academy of Sciences, Energy Research Institute, Qilu University of Technology, Jinan, China.,State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
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Wu X, Li X, Yang Q, Xu Q, Tao Z, Huang X, Wu Y, Tao L, Pi Z, Chen Z, Wang D. Effect of citric acid on extracellular polymeric substances disruption and cell lysis in the waste activated sludge by pH regulation. BIORESOURCE TECHNOLOGY 2020; 302:122859. [PMID: 32018085 DOI: 10.1016/j.biortech.2020.122859] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2019] [Revised: 01/19/2020] [Accepted: 01/21/2020] [Indexed: 06/10/2023]
Abstract
This paper investigated the effects of citric acid (CA) on extracellular polymer destruction and cell lysis in sludge at different initial pH by measuring capillary suction time (CST), extracellular polymeric substances (EPS) and intracellular bound water. The results indicated that under CA concentration at 0.05 g/g suspended solids (SS) and initial pH 4, the CST value decreased from 175.5 s to 112.3 s, slime extracellular polymeric substances (S-EPS) and loosely bound EPS (LB-EPS) content respectively to increase from 4.92 to 41.43, 2.27 to 5.49 mg/g volatile suspended solids (Vss), while tightly bound EPS (TB-EPS) content to decrease from 12.35 to 5.01 mg/g (Vss), which suggested CA could disrupt outer EPS effectively. Intracellular bound water content decreased from 1.23 g/g to 0.41 g/g dry solid (DS). As a result, CA could release intracellular bound water effectively, thereby improving sludge dewatering degree.
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Affiliation(s)
- Xuewei Wu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Xiaoming Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
| | - Qi Yang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Qiuxiang Xu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Ziletao Tao
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Xiaoding Huang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - You Wu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Lingjuan Tao
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Zhoujie Pi
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Zhuo Chen
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
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Sun Z, Ding C, Xi J, Lu L, Yang B. Enhancing biofilm formation in biofilters for benzene, toluene, ethylbenzene, and xylene removal by modifying the packing material surface. BIORESOURCE TECHNOLOGY 2020; 296:122335. [PMID: 31732413 DOI: 10.1016/j.biortech.2019.122335] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 06/10/2023]
Abstract
Polyurethane (PU) sponges are popular packing material in biofilters and their smooth and hydrophobic surface often leads to an uneven distribution and detachment of biofilms. In this work, the surface of PU sponge was modified to obtain higher roughness and positive charge. The performances of two biofilters (BF1 with pristine sponge and BF2 with modified sponge) for benzene, toluene, ethylbenzene, and xylene (BTEX) removal were investigated. Total Volatile Organic Compound (TVOC) removal efficiency and CO2 increment were 61% and 804 ppm for BF2 respectively after start-up, compared with 51% and 538 ppm for BF1. Analysis on biofilms showed that the modification of PU sponge significantly improved the microbial growth, viability and adhesive strength in biofilms, reduced extracellular polymeric substance (EPS) and changed the microbial community. These results demonstrate that modified sponge can enhance biofilm formation and BTEX removal in biofilters and may applied in large-scale applications.
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Affiliation(s)
- Zhuqiu Sun
- Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Cheng Ding
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, PR China
| | - Jinying Xi
- Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, PR China; State Environmental Protection Key Laboratory of Microorganism Application and Risk Control (SMARC), Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, PR China.
| | - Lichao Lu
- Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Bairen Yang
- Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province, Yancheng Institute of Technology, Yancheng 224051, PR China
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Zhang F, Shao J, Yang H, Guo D, Chen Z, Zhang S, Chen H. Effects of biomass pyrolysis derived wood vinegar on microbial activity and communities of activated sludge. BIORESOURCE TECHNOLOGY 2019; 279:252-261. [PMID: 30735935 DOI: 10.1016/j.biortech.2019.01.133] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 01/25/2019] [Accepted: 01/28/2019] [Indexed: 05/14/2023]
Abstract
The effects of wood vinegar (WVG) on microbial activity and communities of activated sludge were investigated in a sequencing batch reactor (SBR) process. Results showed that the optimal WVG concentration was 4 μL/L when the pollutants removal efficiency and microbial activity were promoted by a WVG dilution factor of 1000. WVG could reduce the increase in microbial species richness, which led to a more notable variety of microbial species diversity. The enhanced microbial activity and communities were addressed to the promotion of 7 main classes of microbes in Proteobacteria, Bacteroidetes, Acidobacteria, and Nitrospirae phyla. The growth of ammonia-oxidizing bacteria (AOB), nitrite-oxidizing bacteria (NOB), and main genera of denitrifying bacteria (DNB), phosphorus-accumulating organisms (PAOs), and glycogen-accumulating organisms (GAOs) could be promoted by WVG, which improved the sewage treatment effectiveness in a SBR.
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Affiliation(s)
- Fang Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jingai Shao
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Technology, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Haiping Yang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Dabin Guo
- School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Zhihua Chen
- School of Environment, Henan Normal University, No. 46, Jianshe Road, Xinxiang 453007, Henan, China
| | - Shihong Zhang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hanping Chen
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; Department of New Energy Science and Technology, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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